Carburetor deicer



Oct. 13, 1953 A. A. HAYDEN CARBURETOR DEICER Filed June 16, 1951 INVENTOR. ARTHUR A. HAYDEN ATTORNEY Patented Oct. 13, 1953 2,655,141 CARBURETOR DEIGER Arthur A. Hayden, Kenosha, Wis.,' assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application June 16, 1951, Serial No. 231,946

This invention relates to carburetors for internal combustion engines and consists particularly in means for preventing the formation and accumulation of ice about the throttle valve and idling port.

In carburetors having a butterfly throttle valve and an idling port controlled by the edge of the valve when the latter is closed or nearly closed, under certain operating conditions, ice tends to form on the throttle valve and in the vicinity of the idling port. This is due to the rapid expansion of the air and vaporized fuel passing around the valve which cools the valve and adjacent metal parts so as to condense, and often, to freeze moisture in the entering air. When freezing occurs, the resultant ice formation substantially interferes with the supply of fuel and air to the engine, resulting in erratic firing, or stalling of the engine.

It is an object of this invention to provide means for preventing icing and the consequent ill effects thereof by bringing heated air into the affected area. This is accomplished, by feeding heated air from an external source into the idle system and, thence, through the idling port into the mixture conduit adjacent the areas in which icing normally occurs.

The foregoing and other more specific objects will appear readily from the following description of the invention, as illustrated in the accompanying drawing in which:

Fig. 1 is a side view and transverse vertical section showing a carburetor and manifold embodying the present invention.

Fig. 2 is a fragmentary vertical sectional view of the idling port and. heated air inlet.

Referring now to the drawing the numeral I refers generally to a carburetor having a mixture conduit H with an air inlet opening l2 and an outlet l3 communicating with intake manifold l4. Air inlet 12 is controlled by choke valve 15 mounted on shaft 16, which is rotatably journalled in the mixture conduit wall structure. Outlet I3 is controlled by a throttle valve I! mounted on a shaft [8, which is also rotatably journalled in the wall structure of mixture conduit ll. Venturi stack I9 is formed in the mixture conduit anterior to the throttle valve. vided for supplying fuel to main nozzle passage 23, through metering orifice 25, controlled by metering pin 21, and to idling ports and 3| through passages 32 and 33. Passages 32 and 33 are provided with air bleeds 34 and 35 com-- municating, respectively, with mixture condu t H and the ambient atmosphere. As shown in A constant level fuel chamber 22 is pro-- 3 Claims. (Cl. 123'122) the drawing, idling port 3|" is controlled by an adjusting needle valve 36. Idling port 30 opens to mixture conduit l l in a position for control by throttle valve l5 when the latter is closed, the

edge 31 then being adjacent the portion of the mixture conduit wall surrounding port 30.

A conventional stove 39 mounted on exhaust manifold 40 has an air inlet opening 4| and tubular outlet conduits 42 and 43 leading, respectively, to automatic choke control housing 45 and the enlarged portion 46 of idling passage 33 adjacent idling port 30. shown in Fig. 2 is formed with a small outlet hole 48, and secures hot air conduit 43 in communication with enlarged passage portion 46. Thus, passage 4|, 43, 46 constitutes, in effect, an additional air bleed through which heated air is bled into the idle system.

Operation of the device is as follows:

When the throttle is substantially closed, as during idling, the subatmospheric pressure in the mixture conduit posterior to the throttle causes heated air to be drawn through stove 39, conduit 43, and into the enlarged portion 46 of idle passage 33, where it is mixed with the idling mixture, and from thence drawn through idling port 30 into the mixture conduit. This warm air, accordingly, heats the mixture conduit wall around idling passage enlargement 46 and also the edge of the throttle valve disk. Thus, the formation of ice is prevented on the throttle valve and on the mixture conduit wall adjacent the idling port. Obviously, the idling system will be calibrated for the additional air bleed. However, the warm air may be supplied through one of the bleeds 34 or 35 or to some other point in the idling fuel system.

Although the device described and illustrated herein is a presently preferred embodiment of the invention, the invention may be modified as will occur to those skilled in the art and the exclusive use of all modifications as come within the scope of the appended claims is contemplated.

I claim:

1. In a carburetor having a fuel mixture conduit, a throttle valve therein, a constant level fuel chamber, a fuel port in the wall of said conduit adjacent the edge of said throttle valve, restricted passage means connecting said fuel chamber and said port, said passage means including an enlarged portion immediately adjacent said port, said enlarged portion being open at its outer end, and a removable fitting including a restricted orifice secured in the opening of A fitting 41, clearly said enlarged portion, and a tubular conduit secured at one end to said fitting and at the jacent said port, said enlarged portion beingopen at its outer end, and a tubular; conduit. affixed at one end to the open end of said enlarged portion and at the other nd t0,.a s 0ur.ce,

of heated air.

3. In combination with an internal combustion engine having intake and, exhaust, I II QI'li-a folds, a carburetor having a fuel chamber, a fuel mixture conduit, a throttle valve. therein, a fuel port in the wall of said passage adjacent the edge of said throttle valve when; closed, a

4 passage connecting said chamber and said port and including an enlarged portion adjacent said port, said enlarged portion being open at its outer end a stove mounted on said exhaust manifold, and a tubular conduit secured at one end to said stove and at the other end to said enlarged portion whereby suction in the mixture, conduitmay draw heated air; from said stove into the mixture: conduit to prevent the formation of ice on and adjacent the throttle valve therein.

ARTHUR A. HAYDEN.

Cited; in the file of this patent STATES PATENTS Number Name Date 11,542,823 Manville June 23, 1925 1,365,5l4, Godward July 5, 1932 2,269,706 Brown a Jan. 13, 1942 2,325,372 Coffey July 27,1943 

